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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Flutter has an excellent plugin system and can bind to native code. There is nothing stopping anyone from creating a multiplatform notification framework. That's what package distribution services like pub.dev are for.
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Hence, a higher number means a more popular project.